WO1997015049A1

WO1997015049A1 - Magnetic disk and magnetic recording/reproduction apparatus

Info

Publication number: WO1997015049A1
Application number: PCT/JP1995/002132
Authority: WO
Inventors: Takayuki Nakakawaji; Mituyoshi Shouji; Tomoe Takamura; Hiroshi Sasaki; Shuji Imazeki; Yutaka Ito
Original assignee: Hitachi, Ltd.
Priority date: 1995-10-18
Filing date: 1995-10-18
Publication date: 1997-04-24
Also published as: US6296917B1; CN1492399A; EP0856837B1; EP0856837A1; KR100318175B1; DE69532975D1; KR19990064315A; EP0856837A4; JP3409856B2; DE69532975T2

Abstract

A magnetic disk having a lubricating film that covers a data region and a CSS region formed on the surface thereof. The lubricating film secures low tackiness and low sliding friction in the data region, and secures CSS durability in the CSS region. Since the problem of lubrication between the magnetic disk and a magnetic head can be avoided either in normal operation or in the event of an abrupt stop of the disk drive, high reliability can be secured. The present invention provides also a magnetic recording/reproduction apparatus using the disk. Because the lubricating film formed in the data region of the magnetic disk is firmly fixed to the surface of the magnetic disk, it hardly invites adhesion and has a sufficient film thickness for securing durability under sliding friction. The lubricating film in the CSS region comprises both a lubricant having high fixing force and a lubricant having low fixing force to the surface of the magnetic disk, it has high CSS durability. It is therefore possible to obtain a high-reliability magnetic disk and a high-reliability magnetic recording/reproduction apparatus.

Description

Specification

Magnetic disk and magnetic recording / reproducing device

The present invention relates to a magnetic disk and a magnetic recording / reproducing apparatus, and more particularly to a magnetic disk and a magnetic recording / reproducing apparatus having a high recording density. Background art

Hard-type magnetic recording / reproducing devices have been reduced in diameter of magnetic disks, and have been reduced in size and weight and have higher recording density. As the recording density of magnetic disks has increased, the distance between the magnetic disks and the magnetic head, that is, the flying height of the head has decreased. In the near future, the magnetic head will be in a perfect contact state (contact However, the recording / reproducing of the magnetic head and the operating conditions of the magnetic head and the magnetic disk become more severe. To increase the recording density, it is necessary to smooth the surface of the magnetic disk in order to stabilize the floating as the flying height of the head decreases. For this reason, a head slider equipped with a magnetic disk and a magnetic head The time required for action in the contact state (hereinafter abbreviated as contact sliding) increases, the kinetic friction and wear generated during disk startup increase, and the disk surface becomes smoother. The maximum static friction force (hereinafter, abbreviated as "adhesion") generated between the DonoDisks increases. If the kinetic friction and wear increase due to the contact action, disc crashes and head wear occur intermittently, making recording and reproduction impossible. Also, if strong adhesion occurs, serious problems such as the inability to start the disk and damage to the head will occur.

As a means to solve the above problem, a head slider And the area where the contact / start / stop occurs when the disk starts and stops (hereinafter abbreviated as CSS area) and the area where the head records and plays back while the disk is running (hereinafter abbreviated as data area) A magnetic disk has been developed that separates Generally, the CSS area is formed on the inner periphery of the magnetic disk, and the surface of the magnetic disk is roughened to prevent sticking. On the other hand, in the data area, the surface of the magnetic disk is smoothed to maintain stable head flying. Until now, several lubricating films and lubricating techniques corresponding to a magnetic disk in which a CSS area and a data area are separated have been disclosed. For example, Japanese Patent Application Laid-Open No. 6-36277 discloses that protrusions having a height of about 5 nm are formed on the CSS area and the rail surface of the slider to prevent sticking. Further, Japanese Patent Application Laid-Open No. Hei 6-111292 discloses that a liquid lubricant is applied to the CSS area and a solid lubricant is used for the data area. These conventional technologies relate to a technology for a lubricating film corresponding to a magnetic disk having a data region and a CSS region. This is a technology that can achieve some degree of Considering the lubricating film required in each area based on the action between the head disk in the CSS area and the data area, if the magnetic disk surface is roughened in the CSS area, the adhesion can be reduced to some extent, but when the disk starts up Since the head and the disk come into contact with each other at the time of stop, a lubricating film with excellent continuous sliding durability is also required. On the other hand, in the data area, the surface roughness of the disk must be small and a lubricating film with low adhesion is required. This is because when the head slider is in the data area and the disk suddenly stops due to an error in the device, strong adhesion may occur due to contact with the disk in the data area with small surface roughness. That's why. In other words, the lubrication films formed in the CSS area and the data area have different lubrication performances. A lubricating film is required.

Currently, the lubricant used for magnetic disks is a perfluoropolyether compound having a functional group to be adsorbed on the disk surface. The lubricating film composed of this lubricant forms a layer firmly adsorbed on the disk surface and a layer weakly adsorbed or not adsorbed. For example, when a disk is washed with a perfluorocarbon-based solvent, the strongly adsorbed lubricating layer does not desorb from the disk surface, whereas the less adsorbed lubricating layer easily desorbs from the disk surface. The continuous sliding durability required in the CSS area requires that a part of the lubricant be transferred to the sliding surface of the head slider at the time of action to form a stable friction state. A weak lubricant layer plays an important role. For this reason, sufficient reliability cannot be ensured unless there is a weakly adsorbed layer in the CSS area. On the other hand, with regard to the low adhesiveness required in the data area, when the disk suddenly stops due to a device error and comes into contact with the data area, lubricant aggregates between the head disks and seeks. It is necessary to prevent excessive lubrication of the lubricant by the head, and a layer of weak adsorption that easily moves on the disk surface adversely affects adhesion, contrary to continuous sliding durability. . For this reason, in the data area, it is necessary to reduce the number of weakly adsorbed layers. If a conventional adsorption-type lubricant is applied to the entire surface of the disc and only the data area is cleaned to remove the weakly adsorbed layer, the thickness of the lubricant film in the data area will inevitably be reduced. However, at present, although the contact sliding in the data area is small compared to the CSS area, in the magnetic disk drive where the flying height of the head is further reduced in the future, the head and the disk are in contact even in the data area. The chance of sliding increases, and it is highly likely that continuous sliding durability will be required even in the data area in the near future. Therefore, the thickness of the lubricating film in the data area must not be large enough to withstand single contact sliding. And the film thickness cannot be reduced.

To address such technical problems, considering the above-mentioned conventional technique, Japanese Patent Laid-Open No. 6-1 discloses that a liquid lubricant is applied to the CSS area and a solid lubricant is used to the data area. Although the characteristics of the lubricating film required in each region can be secured in JP-A-11292, there is a disadvantage that the process of forming the lubricating film is complicated. Japanese Patent Application Laid-Open No. 4-53027 discloses that the thickness of the lubricating layer in the data area is made thinner than the thickness of the lubricating layer in the CSS area. Is secured. However, it is necessary to ensure continuous sliding durability even in the data region, and the thickness of the lubricating film cannot be reduced. Therefore, the above-mentioned Japanese Patent Application Laid-Open No. 4-53027 is not sufficient. As described above, at present, there is no effective method for securing sufficient sliding reliability for a disk in which the CSS area and the data area are formed.

An object of the present invention is to solve the above-mentioned problems of the prior art, to provide an effective method for ensuring sufficient sliding reliability for a disk on which a CSS area and a data area are formed, and to provide a high-performance method using this method. Another object of the present invention is to provide a simple magnetic disk and a magnetic recording / reproducing apparatus. Disclosure of the invention

As a means for solving the above-mentioned problem, in the data area on the magnetic disk, a lubricating layer having weak adsorption is reduced as much as possible in order to achieve low adhesion, and the magnetic head and the magnetic disk which are generated sporadically. To easily form a lubricating film with a thickness that can withstand contact sliding, use a lubricant that strongly adheres to the surface of the magnetic disk, or apply a treatment after applying the lubricant. In addition, in the CSS area, taking into account the fact that sufficient continuous sliding durability is ensured and the fact that the lubricant easily transfers to the head slider side, it is possible to adsorb an adsorbent lubricant that is difficult to stick. A method for intentionally forming a weak lubricating layer in the cs S region was devised. Specifically, it is a magnetic disk, a method of manufacturing a magnetic disk, and a magnetic recording / reproducing apparatus described below.

A first means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. A CSS area having a surface roughness of Ra 10 nm or more; and a data area having a surface roughness of Ra 3 nm or less where the magnetic head slider is located during rotation of the magnetic disk. And the following general formulas (I) to (! Π) are provided on the surface of the protective film.

R 1-X- (CF ₂ CF ₂₀ ) _m- (CF ₂₀ ) _n -X- R 2… (I)

_{_{_{F (CF i CF 2 CF 2}}} - 0) n - C 2 F <-X- R 3 - (Π)

F-(CF (C FJ- CF ₂ -0) _n -CF (CF ₃ ) -X- R 4… (m) (where m and n are integers, and R l, R 2, R 3 and R 4 are A lubricating film containing at least one perfluoropolyether compound represented by a hydrocarbon chain, X is a divalent linking group), and the lubricating film is firmly fixed to the surface of the protective film. The ratio of the weakly-fixed lubricant of the lubricating film formed in the CSS region is 10% with respect to the total amount of the lubricant in the SS region. This is the magnetic disk in which the ratio of the lubricant that fixes the lubricating film formed in the data area is less than 10% of the total amount of the lubricant in the data area.

The second means is a fixing method in which the lubricating film in the first means is not washed and removed with a perfluorocarbon-based solvent but is firmly fixed to the surface of the protective film and washed and removed with a perfluorocarbon-based solvent. This is a magnetic disk composed of a weak lubricant.

The third means is to sequentially laminate a base film, a magnetic film, and a protective film on a non-magnetic substrate. A magnetic disk, wherein when the magnetic disk starts rotating and when the magnetic disk stops rotating, the surface of the protective film on which the magnetic head slider is located has a roughness of Ra1Onm or more; And a data area where the roughness of the surface of the protective film where the magnetic head slider is located is 3 nm or less, and the surface of the protective film is represented by the general formulas (I) to (! 0). After applying a lubricant containing at least one perfluoropolyether compound to the entire surface of the magnetic disk, heating the entire surface of the magnetic disk to 80 ° C. or higher, or irradiating the entire surface or the data area with ultraviolet rays, Next, the CSS region is washed with a perfluorocarbon-based solvent to form a lubricating film having a thickness of 1.5 nm or more formed in the CSS region and a lubricating film having a thickness of 1 nm or more formed in the data region. With Magnetic disk. A fourth means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially stacked on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. A CSS area having a surface roughness of Ra 10 nm or more; and a data area having a surface roughness of Ra 3 nm or less where the magnetic head slider is located during rotation of the magnetic disk. After applying a lubricant containing at least one or more perfluoropolyether compounds represented by the general formulas (I) to (! Π) on the surface of the protective film, The entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface or the data region is irradiated with ultraviolet rays, and then the entire surface of the magnetic disk is washed with a perfluorocarbon-based solvent. ~ (M By applying a perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds of (1), a lubricating film having a film thickness of 1.5 nm or more formed in the CSS region is formed. A lubricating film with a thickness of 1 nm or more formed in the data area It is a magnetic disk provided.

Fifth means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. A CSS area having a surface roughness of Ra 10 nm or more; and a data area having a surface roughness of Ra 3 nm or less where the magnetic head slider is located during rotation of the magnetic disk. After applying a lubricant containing at least one of the polyfluoropolyether compounds represented by the general formulas (I) to (! Π) on the surface of the protective film, The entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet light, and then the entire surface of the magnetic disk is washed with a perfluorocarbon solvent. By applying a perfluoropolyether compound having a functional group which chemically reacts with the surface of the protective film selected from the perfluoropolyether compounds represented by the general formulas (I) to (m), The magnetic disk includes a lubricating film having a thickness of 1.5 nm or more formed in the CSS region and a lubricating film having a thickness of 1 nm or more formed in the data region. Sixth means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. A CSS area having a surface roughness of Ra 10 nm or more; and a data area having a surface roughness of Ra 3 nm or less where a magnetic head slider is located during rotation of the magnetic disk. And at least one or more perfluoropolyether compounds having a functional group chemically reactive with the surface of the protective film represented by the general formulas (I) to (! （) On the surface of the protective film. After applying a lubricant containing the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or more, or Alternatively, the data area is irradiated with ultraviolet light, the entire surface of the magnetic disk is washed with a perfluorocarbon solvent, and then the data area is selected from the perfluoropolyether compounds of the general formulas (I) to (ΙΠ). By applying a perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film, the lubricating film having a thickness of 1.5 nm or more formed in the CSS region and the data region are formed. This is a magnetic disk provided with a formed lubricating film having a thickness of 1 nm or more.

A seventh means is a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein a magnetic head slider is provided when the magnetic disk starts and stops rotating. The surface of the protective film where the surface of the protective film is located has a roughness of Ra1 O nm or more, and the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk has a surface roughness of Ra3. and a lubricant containing at least one of the perfluoropolyether compounds represented by the general formulas (I) to (m) on the surface of the protective film. The entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays, and then the CSS area is washed with a perfluorocarbon solvent. And the one in the C S S region. 5 n m lubricating film thickness was formed on the following, a magnetic disk manufacturing method for forming a 1 n m or more thickness lubricating film of the data area.

An eighth means is the method of manufacturing a magnetic disk according to the seventh means, wherein the entire surface of the magnetic disk is washed with a perfluorocarbon solvent, and then the pars of the general formulas (1) to (! Π) are added to the CSS region. A perfluoropolyether compound having an adsorptive functional group selected from a fluoropolyether compound is applied to form a lubricating film having a thickness of 1.5 nm or more in the CSS region. Forming a lubricating film having a thickness of 1 nm or more in the data area.

A ninth means is the magnetic disk manufacturing method according to the seventh means, wherein the entire surface of the magnetic disk is washed with a perfluorocarbon-based solvent, and then the perfluoropolyether-based compound represented by any of the general formulas (I) to (!！) is used. Applying a perfluoropolyester-based compound having a functional group that chemically reacts with the surface of the protective film selected from the compound to form a lubricating film having a thickness of 1.5 nm or more in the CSS region; A magnetic disk manufacturing method for forming a lubricating film having a thickness of 1 nm or more in the data area.

A tenth means is the method of manufacturing a magnetic disk according to the seventh means, wherein the entire surface of the magnetic disk is ripened to 80 ° C. or higher or irradiated with ultraviolet light, and then subjected to the general formulas (I) to (! 全面). After applying a perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds of (1) to the entire surface of the magnetic disk, and then washing the data area with a perfluorocarbon solvent, A perfluoro-opened polyether compound having a chemically reactive functional group selected from the perfluoropolyether compounds represented by the general formulas (I) to (! Π) is applied, and 1.5 nm or more is applied to the CSS region. A method of manufacturing a magnetic disk, comprising forming a lubricating film having a thickness of 1 nm and a lubricating film having a thickness of 1 nm or more in the data area.

The first means includes a magnetic head, a magnetic head slider having a magnetic head mounted thereon, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate. In the magnetic recording / reproducing apparatus, the roughness of the surface of the protective film on which the magnetic head slider 1 is located is Ra10 nm or more when the magnetic disk starts and stops rotating. And the protection in which the magnetic head slider is positioned during rotation of the magnetic disk. A data area having a film surface roughness of Ra 3 nm or less, and at least one of the perfluoropolyether compounds represented by the general formulas (I) to (! に) on the protective film surface. A lubricating film including the above is formed, and the lubricating film is composed of a lubricant firmly fixed to the surface of the protective film and a lubricant weakly fixed, and fixing the lubricating film formed in the CSS region. The ratio of the weak lubricant is 10% or more of the total amount of the lubricant in the CSS region, and the ratio of the weak lubricant for fixing the lubricant film formed in the data region is the lubrication of the data region. Less than 10% of the total amount of the agent, and the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area.

The dynamic friction coefficient is 1.5 or less, the dynamic friction coefficient is 1.0 or less, and the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the CSS region is 1.0 or less, and the dynamic friction coefficient is 0.5 or less. It is a magnetic recording and reproducing device.

The first means comprises a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate. In the magnetic recording / reproducing apparatus, when the magnetic disk starts and stops rotating, the surface roughness of the protective film on which the magnetic head slider 1 is located is Ra10IIm or more. And a data area where the roughness of the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk is less than Ra 3 nm. After applying at least one or more of the perfluoropolyether-based compounds represented by (!) To the entire surface of the magnetic disk, heating the entire surface of the magnetic disk at 80 ° C. or higher, or Purple over the entire surface or the data area The data area is then washed with a perfluorocarbon solvent, and the lubricating film formed in the CSS area has a thickness of 1.5 nm or more, and the lubricating film formed in the data area has a thickness of 1 nm. Film thickness of nm or more The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1.0 or less in the data area. This is a magnetic recording and reproducing device with a maximum static friction coefficient of 1.0 or less and a dynamic friction coefficient of 0.5 or less between the magnetic disk and the magnetic disk.

A thirteenth means is the magnetic recording / reproducing apparatus according to the first means, wherein the magnetic disk is configured such that after cleaning the data area with a perfluorocarbon solvent, the CSS area has the general formula (I ) A perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds represented by the following formulas (1) to (3) is applied, and the lubricating film formed in the CSS region has a thickness of 1.5 nm or more. A magnetic recording / reproducing apparatus, wherein the lubricating film formed in the data area has a thickness of 1 nm or more.

A fifteenth means is the magnetic recording / reproducing apparatus according to the twenty-second means, wherein the magnetic disk is provided with the following general formula (I): A perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compounds represented by (! Π) is applied to form the above-mentioned CSS region. The magnetic recording / reproducing apparatus has a lubricating film having a thickness of 1.5 nm or more and a lubricating film formed in the data area having a thickness of 1 nm or more.

The fifteenth means includes a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which an F ground film, a magnetic film, and a protective film are sequentially stacked on a non-magnetic substrate. In the magnetic recording / reproducing apparatus, the roughness of the surface of the protective film on which the magnetic head slider 1 is located is Ra10 nm or more when the magnetic disk starts and stops rotating. When, The surface of the protective film, on which the magnetic head slider 1 is positioned during rotation of the magnetic disk, has a data area with a roughness of Ra 3 nm or less, and the surface of the protective film has the general formula (I) to (! Π). After applying at least one or more of the perfluoropolyether compounds represented by the formula (1) to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated at 80 ° C or higher, or the entire surface of the magnetic disk or the The data area is irradiated with ultraviolet light, and the perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds represented by the above general formulas (I) to (! Π) is applied to the magnetic disk. After applying to the entire surface and then cleaning the data area with a perfluoro-opening carbon-based solvent, a chemical selected from the perfluoropolyether compounds represented by the general formulas (〗) to (! Π) A perfluoropolyether compound having a reactive group is applied, and the lubricating film formed in the CSS region has a thickness of 1.5 nm or more, and the lubricating film formed in the data region has a thickness of 1 nm or more. The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1.0 or less in the data area. This magnetic recording / reproducing device has a maximum static friction coefficient between the head slider and the magnetic disk of 1.0 or less and a dynamic friction coefficient of 0.5 or less.

A sixteenth means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. A CSS area where the surface roughness of the film is Ra1 Onm or more, and a data area where the roughness of the surface of the protective film where the magnetic head slider is located during rotation of the magnetic disk is Ra3 nm or less. And the following general formulas (IV) to (XII) on the surface of the protective film.

F (CF ₂ CF ₂ CF ₂ 0),-C ₂ F ₄ -C 0 NH-C ₃ H _c -S i (0 C ₂ HJ ₃ … (IV)

F (CF (CF ₃ )-CF ₂ 0) _r .-CF (CF ₃ )-C0NH- C ₃ H _c

One S i (OC ₂ H… (V)

(C ₂ _{_{H.Rei) 3 S i - C 3 H}} e -NHC0- (CF 2 CF 2 0) m

-(CF _z O) _n -CONH- C ₃ H ₆ -S i (OC ₂ H ₅ ) ₃ … (VI) C _E H ₅ -O-C ₆ H ₄ -H ₃ N ⁺ "OC 0-(CF ₂ CF _z 0) _ra

— (CF ₂ 〇) _n — CO〇一⁺ NH ₃ -C _e H ₄ -O-C _B H ₅ … (VE) F (CF ₂ CF ₂ CF ₂ — 0) _n — C ₂ F, — CH ₂ 〇 H… (VI)

HO- CH _2- (CF ₂ CF ₂ 0) _m- (CF ₂ 0) „-CH ₂ OH… (IX) HO— (CH ₂ CH ₂ —〇) _p — CH ₂ CF ₂ — (CF ₂ CF ₂ 0) _m

-(CF ₂ 0) _n -OC F ₂ CH ₂ (0- CH ₂ CHj _Q -OH… (X) F (CF ₂ CF ₂ CF ₂ 0) _n -C ₂ F ₄ -C00 "+ NH ₃ — C _e H, —〇

― C _e H ₅ … (XI)

F (CF (CF ₃ )-CF ₂₀ ) _n -CF (CF ₃ )-COO ~ ⁺ NH ₃

— H, —〇一 C _e H ₅ … (ΧΠ)

_H , (CF ₂ CF ₂ 0) _m- (CF ₂ 0) _n

-… ( ^Xffl)

(Where m, n, p, and q are integers) after applying a lubricant containing at least one or more perfluoropolyether-based compounds to the entire surface of the magnetic disk. By heating to 0 ° C or more or irradiating the entire surface of the magnetic disk or the data area with ultraviolet rays, and then cleaning the CSS area with a perfluorocarbon-based solvent, And a lubricating film having a thickness of 1.5 nm or more formed in the data area and a lubricating film having a thickness of 1 nm or more formed in the data area.

A seventeenth means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a nonmagnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts rotating and stops rotating. The CSS area where the film surface roughness is Ra 1 O nm or more, and the data where the surface roughness of the protective film where the magnetic head slider is located during rotation of the magnetic disk is Ra 3 nm or less. A lubricant containing at least one of the perfluoropolyether compounds represented by the general formulas (IV) to (XII) on the surface of the protective film. The entire surface of the magnetic disk is heated to 80 ° C. or more, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays.Then, the entire surface of the magnetic disk is washed with a perfluorocarbon solvent, and the general area is applied to the CSS area. A perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds of the formulas (VII) to (XII) is applied, and a film thickness of 1.5 nm or more is formed on the CSS region. And a lubricating film having a thickness of 1 nm or more formed in the data area.

The eighteenth means is a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. A CSS area having a surface roughness of Ra1 O nm or more; and a data area having a surface roughness of Ra3 nm or less where the magnetic head slider is located during rotation of the magnetic disk. A lubricant containing at least one of perfluoropolyether compounds represented by the general formulas (IV) to () on the surface of the protective film. After coating the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or higher.Or, the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays.Then, the data area is washed with a perfluorocarbon-based solvent. Applying a perfluoropolyether compound having a functional group chemically reactive with the surface of the protective film selected from the perfluoropolyether compounds represented by the general formulas (IV) to (VI) to the region; The magnetic disk includes a lubricating film having a thickness of 1.5 nm or more formed in the CSS region and a lubricating film having a thickness of 1 nm or more formed in the data region.

The nineteenth means is that, in a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the protective film in which the magnetic head slider is positioned when the magnetic disk starts rotating and stops rotating. A CSS area having a surface roughness of Ra1 O nm or more; and a data area having a surface roughness of Ra3 nm or less where the magnetic head slider is located during rotation of the magnetic disk. After applying a lubricant containing at least one or more perfluoropolyether compounds represented by the general formulas (IV) to (VI) on the surface of the protective film, The entire surface of the disk is heated to 80 ° C. or higher, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays, and then the surface of the protective film is formed of a perfluoropolyether represented by any of the general formulas (W) to (Xffl). Compound A polyfluoropolyether compound having an adsorptive functional group selected from the group consisting of: is applied to the entire surface of the magnetic disk, and then the data area is washed with a carbon-based solvent having a perfluoro opening. ) To (VI), a perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compounds described in (1) to (6). and a lubricating membrane with a thickness of 1 nm or more formed in the data area. It is a magnetic disk.

A twenty-first means is a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein a magnetic head slider is provided when the magnetic disk starts rotating and stops rotating. Where the roughness of the surface of the protective film where Ra is located is Ra10 nm or more, and the roughness of the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk.

Forming a data area of Ra 3 nm or less, and then forming at least one or more of perfluoropolyether compounds represented by the general formulas (IV) to (XD1) on the surface of the protective film. Is applied to the entire surface of the magnetic disk, and then the entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet light. A method for manufacturing a magnetic disk, comprising washing with a carbon-based solvent, forming a lubricating film having a thickness of 1.5 nm or more in the CSS region, and forming a lubricating film having a thickness of 1 nm or more in the data region. .

A twenty-first means is a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein a magnetic head slider is provided when the magnetic disk starts rotating and stops rotating. Where the roughness of the surface of the protective film where Ra is located is Ra1 O nm or more, and the roughness of the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk.

Forming a data area of Ra 3 nm or less, and then containing at least one or more of the perfluoropolyether compounds represented by the general formulas (IV) to (xm) on the surface of the protective film. After applying a lubricant to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays. After washing with a solvent, the general formula (W) To a perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds (XH) to (XH), and a lubricating film having a thickness of 1.5 nm or more is applied to the CSS region. Forming a lubricating film having a thickness of 1 nm or more in the data area.

A second means is a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein a magnetic head slider is provided when the magnetic disk starts rotating and stops rotating. Where the roughness of the surface of the protective film where Ra is located is Ra10 nm or more, and the roughness of the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk.

Forming a data area of Ra 3 nm or less, and then containing at least one or more of the perfluoropolyether compounds represented by the general formulas (IV) to (XII) on the surface of the protective film. After applying a lubricant to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays. Washing with a solvent, and a perfluoropolyether compound having a functional group chemically reactive with the surface of the protective film selected from the perfluoropolyether compounds represented by the general formulas (IV) to (VI) in the data area. A magnetic disk manufacturing method in which a material is applied, a lubricating film having a thickness of 1.5 nm or more is formed in the CSS region, and a lubricating film having a thickness of 1 nm or more is formed in the data region.

A second means is a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein a magnetic head slider is provided when the magnetic disk starts rotating and stops rotating. Where the roughness of the surface of the protective film where Ra is located is Ra10 nm or more, and the roughness of the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk. Forming a data area of Ra 3 nm or less, and then forming on the surface of the protective film selected from the perfluoropolyether compounds represented by the general formulas (IV) to (VI) on the surface of the protective film. After applying at least one or more perfluoropolyether-based compounds having a chemically reactive functional group to the entire surface of the magnetic disk, and heating or irradiating the entire surface of the magnetic disk at 80 ° C. or higher, the general formula A perfluoropolyether compound having an adsorptive functional group selected from perfluoropolyether compounds represented by (VI!) To (XII) is applied to the entire surface of the magnetic disk. After washing with a perfluorocarbon-based solvent, a functional group chemically reacting with the surface of the protective film selected from the perfluoropolyether-based compounds represented by the general formulas (IV) to (VI) is provided. A magnetic disk in which a perfluoropolyether compound to be applied is coated, a lubricating film having a thickness of 1.5 nm or more is formed in the CSS region, and a lubricating film having a thickness of 1 nm or more is formed in the data region. It is a manufacturing method. The twenty-fourth means includes a magnetic head, a magnetic head slider having a magnetic head mounted thereon, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate. In the magnetic recording / reproducing apparatus, the roughness of the surface of the protective film on which the magnetic head slider 1 is located is Ra10 nm or more when the magnetic disk starts and stops rotating. And a data area where the surface of the protective film on which the magnetic head slider 1 is located during rotation of the magnetic disk has a roughness of Ra 3 nm or less, and then the surface of the protective film has the general formula (IV) ) To (Xffl), after applying at least one or more of the perfluoropolyether-based compounds over the entire surface of the magnetic disk, ripening the entire surface of the magnetic disk at 80 ° C or higher, or Or the data area is purple After irradiating with an external ray, the data area was washed with a carbon-based solvent having a perforated opening. The thickness of the lubricating film formed in the data area is 1 nm or more, and the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1 nm. The dynamic friction coefficient is less than 1.0, the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the CSS area is less than 1.0, and the dynamic friction coefficient is less than 0.5. It is a recording and reproducing device.

The twenty-fifth means is a magnetic head having a magnetic head, a magnetic head slider having a magnetic head mounted thereon, and a magnetic disk having a base film, a magnetic film, and a protective film sequentially laminated on a non-magnetic substrate. In the recording / reproducing apparatus, when the magnetic disk starts and stops rotating, the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra10 nm or more, and a CSS area. The surface of the protective film, on which the magnetic head slider 1 is positioned during rotation of the magnetic disk, has a data area with a roughness of Ra 3 nm or less. Then, the surface of the protective film has the general formula (IV) to (IV). XII), after applying at least one or more of the perfluoropolyether-based compound to the entire surface of the magnetic disk, heating the entire surface of the magnetic disk at 80 ° C. or higher, or Data area And external irradiation, then washing the entire disk surface with perforations Rollo carbon-based solvent, the C S S region in the general formula (W) ~

(Xffl) a perfluoropolyether compound having an adsorptive functional group selected from perfluoropolyether compounds selected from perfluoropolyether compounds, and the lubricating film formed in the CSS region has a thickness of 1.5 nm or more. The lubricant film formed in the data area has a thickness of 1 nm or more, the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1 or less. 2.0 or less, and the maximum static friction coefficient generated between the magnetic head slider 1 and the magnetic disk in the CSS region is 1.0 or less, A magnetic recording / reproducing device having a dynamic friction coefficient of 0.5 or less.

The twenty-sixth means includes a magnetic head, a magnetic head slider having a magnetic head mounted thereon, and a magnetic disk having a base film, a magnetic film, and a protective film sequentially laminated on a non-magnetic substrate. In the magnetic recording / reproducing apparatus, the roughness of the surface of the protective film on which the magnetic head slider 1 is located is Ra10 nm or more when the magnetic disk starts and stops rotating. And a data area in which the surface of the protective film on which the magnetic head slider 1 is located during rotation of the magnetic disk has a roughness of Ra 3 nm or less. Then, the surface of the protective film has the general formula (IV) After applying at least one or more of the perfluoropolyether compounds represented by (XD1) to the entire surface of the magnetic disk, the entire surface of the magnetic disk is ripened at 80 ° C. or higher, or the entire surface of the magnetic disk is Or the data area After irradiating with outside light, and then cleaning the data area with a perfluorinated carbon-based solvent, it chemically reacts with the surface of the protective film selected from the perfluorinated polyether compounds represented by the general formulas (IV) to (VI). A lubricating film formed in the CSS region has a thickness of 1.5 nm or more, and a lubricating film formed in the data region has a thickness of 1 nm or more. The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1.0 or less in the data area. This magnetic recording and reproducing device has a maximum static friction coefficient between magnetic disks of 1.0 or less and a dynamic friction coefficient of 0.5 or less.

A twenty-seventh means is a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein a magnetic head slider is provided when the magnetic disk starts rotating and stops rotating. Where the roughness of the surface of the protective film where R is located is not less than Ra1Onm, and the rotation speed of the magnetic disk. The roughness of the protective film surface where the magnetic head slider 1 is located during

Forming a data area of Ra 3 nm or less, and then forming the surface of the protective film selected from the perfluoropolyether compounds represented by the general formulas (IV) to (VI) on the surface of the protective film. After applying at least one or more perfluoropolyether compounds having a functional group chemically reacting with the entire surface of the magnetic disk, heating the entire surface of the magnetic disk at 80 ° C. or higher, or irradiating with ultraviolet light, A perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds represented by the general formulas (W) to (XID) is applied to the entire surface of the magnetic disk. The data area is washed with a perfluorocarbon-based solvent, and then a functional group chemically reacting with the surface of the protective film selected from the perfluoropolyether-based compounds represented by the general formulas (IV) to (VI) is added. A lubricating film formed in the CSS region has a thickness of 1.5 nm or more, and a lubricating film formed in the data region has a thickness of 1 nm or more, The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less and the dynamic friction coefficient is 1.0 or less in the data area, and the maximum friction coefficient between the magnetic head slider and the magnetic disk is 1.0 or less in the CSS area. The magnetic recording and reproducing device has a maximum static friction coefficient of 1.0 or less and a dynamic friction coefficient of 0.5 or less. A twenty-eighth means is the magnetic disk according to the first means, wherein the diameter of the magnetic disk is 88.9M or less.

A twentieth means is the magnetic disk according to the seventh means, wherein the diameter of the magnetic disk is 88.9 dragons or less.

A thirtieth means is the magnetic disk according to the first means, wherein the diameter of the magnetic disk is 88.9111111 or less.

The present invention is based on the assumption that the CSS area has a strong fixed lubricant and a weak fixed lubricant. It is a technology that can secure continuous sliding durability by forming a lubricating layer that is composed and a lubricating layer that is mainly composed of a strongly fixed lubricant in the data area to reduce adhesion. In this case, the thickness of the lubricating layer in the data area where the amount of the weakly fixed lubricant is small needs to be increased to some extent in order to cope with accidental contact action in the data area due to the recent decrease in flying height. For this reason, not only select a reactive type or a lubricant having a highly adsorptive functional group, or thicken the layer of a highly fixed lubricant by heating or UV treatment, but also reapply only the data area. Conversely, if the amount of weakly fixed lubricant in the CSS area is low, apply the lubricant to the CSS area again. By forming a lubricating film having such a configuration, it is possible to obtain a highly reliable magnetic disk and magnetic disk device that can satisfy the sliding performance required in each of the data area and the CSS area. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an external view of a magnetic disk manufactured in Example 1 and a cross-sectional view of a boundary 3 between a CSS area and a data zone.

FIG. 2 is a schematic diagram of a measuring device for the CSS test and the adhesion test.

FIG. 3 is a sectional view of the magnetic recording / reproducing apparatus according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, examples of the present invention will be described, but the present invention is not limited to these examples.

(Example 1)

NiP base film 0.5 μππ, Cr film 0.5 μππ, Co—Cr—Pt film 60 nm on a 3.5-inch-diameter aluminum alloy substrate with mirror-polished surface A magnetic disk formed by sputtering a carbon protective film 20 Got ready. Next, a fluororesin particle having a diameter of 0.5 μππ is electrostatically applied to a region of the magnetic disk having a radius of 15 mm to 2 Onun, and the entire surface of the magnetic disk is etched with oxygen to a thickness of 10 nm. It was washed off. As a result, cylindrical protrusions having a diameter of 0.5 μππ were uniformly formed in a region with a radius of 15 nun force and a radius of 20 mm. That is, a CSS area with a center line average roughness of Ra 15 nm is formed in the area with a radius of 15 to 2 mm, and the other areas are smooth with a center line average roughness of Ra 1.2 nm. Data area is formed. Next, represented by the following general formula (IV)

_{_{_{F (CF 2 CF 2 CF 2}}} 0) n - C 2 F, - CONH - C 3 H e

-S i (〇C ₂ H… (IV) A solution of perfluoropolyether compound (IV) dissolved in a fluorinated solvent (Sumitomo 3M, PF5052) at a concentration of 0.01 wt% (1 The solution (1) was applied to a magnetic disk by a dipping method and dried sufficiently.The conditions for the dip coating were as follows.

Penetration rate into solution: 1 Onun / s

Residence time in solution: 180 s

Speed of withdrawal from solution: 2.5 I / S

Next, the applied magnetic disk was heated at 100 ° C. for 2 hours. As a result, the perfluoropolyether compound (IV) chemically reacts with the surface of the protective film and is firmly fixed on the disk surface. Then, it is represented by the following general formula (XI)

F (CF ₂ CF ₂ CF ₂ 〇) _n — C ₂ F ₄ _ C〇 0— ⁺ NH ₃ -C ₆ H ₄ -0.1 C ₆ H ₅ … (XI) Perfluoropolyether compound (XI) The solution (2) dissolved in a fluorine-based solvent (PF5052, manufactured by Sumitomo 3M, Ltd.) at a concentration of 0.01 wt% was In this case, it was applied to a magnetic disk by a dipping method and dried sufficiently. Next, only the data area of the coated disk was washed with the fluorine-based solvent. There are two types of cleaning: a method in which the disk is rotated while the data area is immersed in a fluorine-based solvent, and a method in which the fluorine-based solvent ejected from the nozzle is applied only to the data area while rotating the disk using a spinner. In this embodiment, a method using a spinner is employed. The number of revolutions of the spinner is 100 O rpm, and the ejection amount of the fluorine-based solvent from the nozzle is 50 ml / min.

The sputtered magnetic disk fabricated in this way has a lubricating layer that chemically reacts with the disk surface in the CSS region, that is, a strongly fixed lubricating layer and a weakly fixed lubricating layer composed of a perfluoropolyether compound (XI). Layers are formed. Furthermore, only a strongly fixed lubricating layer composed mostly of perfluoropolyether compound (IV) is formed in the data area. The thickness of the lubricating layer in the data area is 2.2 nm, and the thickness of the lubricating layer in the CSS area is 2.7 nm. FIG. 1 shows an external view of a magnetic disk manufactured in this example and a cross-sectional view of a boundary 3 between the CSS area and the data area.

A CSS (Contact-Start-Stop) test and an adhesion test were performed on the sputtered magnetic disk under the following experimental conditions. Fig. 2 shows the outline of the measuring device.

The magnetic disk 7 to be measured is mounted on a spindle 8 directly connected to the motor 1 at the bottom of the apparatus, and is fixed with a disk holder 9. Heads slider 1 2 is of the in-line data Eve rail surface is in contact with the rotating direction and the forward direction of the disk (A 1 ₂ 〇 ₃ T i C steel 2 0 T), is connected to the load cell 1 0 It is fixed to arm 13. The stage 11 to which the load cell 10 is fixed is movable in the radial direction, and the evaluation at each track is It is possible. The frictional force generated between the head slider 12 and the magnetic disk 7 by rotating the motor is measured by a load cell.

In the CSS evaluation experiment, in the CSS region, the disk was repeatedly rotated and stopped at short intervals, and the CSS was performed up to 100,000 times. During this time, the number of CSSs is 1, 50, 100, 500, 100, 0, 0, 0, 0, 0, 0, 0 The disk was stopped, the head was brought into contact for 2 seconds, and then the maximum kinetic friction force was measured when rotating at 1 Orpm. The number of times the disk crashed C S S was also measured. A disk crash is a condition in which the carbon protective film underlying the lubricating film has been completely worn and the magnetic film has been exposed.If the crash occurs, a sliding mark that can be visually observed is generated, and the number of CSSs up to that point Was measured and the experiment was stopped. For the maximum kinetic friction force when the disk crashed in less than 100,000 times, the maximum kinetic friction coefficient up to the number of times SS the disk crashed was used. The maximum rotation speed of the disk is 540 Orpm, and the pressing load of the head is 3.0 g. On the other hand, in the data area, the head is usually in a floating state, so the disk was operated for 20 hours with the head floating. However, assuming that the disk stopped due to accidental trouble with the magnetic disk unit, the time was measured at 4 hours, 8 hours, 12 hours, 16 hours, and 20 hours (at the end of measurement) from the start of the experiment. The disk was stopped, and the maximum kinetic friction force was measured when the head was brought into contact for 2 seconds and then rotated at 1 Orpm, as in the measurement in the CSS area. We also observed sliding marks on the disk surface, and in the event of a crash, stopped the experiment at that point.

The adhesion was measured by bringing the head's slider into contact with the disk for 12 hours, then rotating the disk at low speed, and measuring the maximum static friction force generated immediately after the rotation. The measurement is for the head pressing load in both the CSS area and the data area. The test was performed at 3.0 g and a disk rotation speed of 1 rpm. Table 1 shows the above evaluation results.

Table 1

C S S test viscosity ¾ g (test

C S S area Data area Maximum static friction force (g f) Maximum dynamic friction Until a crash Maximum dynamic friction

B> T¾ area i-P shell area Friction (gf) CSS times Friction (gf) time (h) Example 1 1.86 6〉 1 0 0 0 0 0 2.16> 2 0 1.8 6 2.12 Example 2 1.6.7 7> 1 0 0 0 0 0 2.38> 2 0 1.9 5 2.36 Example 3 1.9> 1 0 0 0 0 0 2.0 1> 2 0 1.6 6 2.3 Comparative example 1 7.8 6 5 0 0 0 3.12> 2 0 1.3 5 2.3 1 Comparative example 2 1.82 2〉 1 0 0 0 0 0 3.5 1> 2 0 1.8 6 2 7.6 Comparative example 3 1.6 2〉 1 0 0 0 0 0 1 2.6.8 8 1.9 2 2.28 Comparative example 4 1. 5 1〉 1 0 0 0 0 0 2.9 5> 2 0 1.6 9 3 2.8

This example is compared with Comparative Example 1 in which only the perfluoropolyether compound (IV) used in this example was applied to the same magnetic disk surface. In this example, both the data area and the CSS area were subjected to the CSS test and the adhesion. While good results were obtained in the test, in Comparative Example 1, the disk crashed in the CSS test in the CSS area, although the adhesion in the data area was low. In Comparative Example 2 in which the perfluoropolyether compound (XI) was applied after the perfluoropolyether compound (IV) and the data area was not cleaned in the same manner as in the present example, The results are good, but there is strong sticking in the data area.

(Example 2)

The same sputtered magnetic disk as in Example 1 was prepared. Next, a solution was prepared by dissolving 0.005 wt% of a perfluoropolyether compound (VI) represented by the following general formula (VI) in the same fluorine-based solvent as in Example 1, and the same conditions as in Example 1 were used. After the dip coating, heat treatment was performed at 120 ° C. for 10 minutes, and then the entire surface of the magnetic disk was washed with the same fluorine-based solvent. In this case, the thickness of the lubricating layer is 0.75 mn.

(C ₂ H ₅ _{_{〇) 3 S i - C 3 H}} e - NH C0- (CF 2 CF 2 0) m

_{_{- (CF 2 0) n -}} CON H- C 3 H e - S i (0 C 2 HJ 3 ... (VI) then fluorolubricant shown in bets' following general formula (VI) (VI) the fluorine A 0.007 wt% solution was prepared in the

F (CF ₂ CF ₂ CF ₂ — 0). — C, — CH ₂ OH (VI) Coating was performed in the same manner as in Example 1, and only the data area was washed with the same fluorine-based solvent. Further, a 0.005 wt% solution of the above perfluoropolyether compound (VI) was applied again to the data area using a spinner. The thickness of the lubrication layer in the data area is 1.96 nm, and the thickness of the lubrication layer in the CSS area is 1.84 nm. _c that is nm

The CSS properties and adhesive properties of the lubricating film produced in this example were measured in the same manner as in Example 1. Table 1 shows the results. Compared to Comparative Example 3 in which the perfluoropolyether compound (VI) was not applied again in this example, the results of this example were superior in both CSS properties and adhesive properties. In the CSS zone, a sliding mark is generated in the data area, while being the same as in the present embodiment. This is thought to be due to the fact that the head floats in the data zone, but because of the low flying height, the head is in contact with the disk even during disk rotation. Is not enough to maintain sufficient sliding durability.

(Example 3)

The same sputtered magnetic disk as in Example 1 was prepared. Next, a solution was prepared by dissolving a perfluoropolyether compound (Xffl) represented by the following structural formula (Xffl) in the same fluorine-based solvent as in Example 1 at a concentration of 0.05 wt%, and dehydrated under the same conditions. After heat treatment at 110 ° C for 2 hours after the tip coating, the entire surface was washed with the same fluorine-based solvent. The thickness of this lubricating layer is 0.8 nm.

Next, a solution was prepared by dissolving 0.07 wt% of a perfluoropolyether compound (VH) represented by the following structural formula (vn) in the fluorine-based solvent,

H. One 0-H, — H ₃ N ⁺ one 0 C 0-(CF ₂ CF ₂ 〇) _ra -(CF ₂ 0) _n -COO " ⁺ NH ₃ -C _E H _< -0-C _G H ₆ … () Coated in the same manner as in Example 1, and heat treated only at the data area at 110 ° C for 2 hours After that, the film was washed with the same fluorine-based solvent, and the thickness of the data region was 1.85 nm, and the thickness of the lubricating layer in the CSS region was 2.31 nm. The CSS properties and adhesive properties of the lubricating film were measured in the same manner as in Example 1. The results are shown in Table 1. In this example, the perfluoropolyether compound was used.

Compared to Comparative Example 4 in which the data area was not cleaned after the application of (), the results of this example were superior in both CSS properties and adhesive properties, whereas the CSS area of Comparative Example 4 was excellent. Was equivalent to the present example, but produced strong adhesion in the data area.

(Example 4)

The magnetic disk manufactured in Example 1 was mounted on a 3.5-inch magnetic recording / reproducing apparatus. Figure 3 shows a schematic diagram of the device. While operating this magnetic recording / reproducing apparatus and the same type 3.5-inch magnetic recording / reproducing apparatus (Comparative Example 5) on which the magnetic disk manufactured in Comparative Example 2 was mounted, the power was temporarily turned off once and the data area was forcibly forced. And left for 24 hours. As a result, after restarting, the magnetic disk device of the present embodiment was started and no abnormality was found in recording / reproducing, whereas the magnetic recording / reproducing device of Comparative Example 5 could not be started and recording / reproducing became impossible. Was. As a result of checking the disk in the device of Comparative Example 5, it was found that strong adhesion occurred between the head slider and the disk in the data area.

[Comparative Example 1]

The same sputtered magnetic disk as in Example 1 was prepared. Next, the following general formula (IV) used in Example 1

F (CF ₂ CF ₂ CF ₂ 0) n- C ₂ F ₄ -CONH- C ₃ H _E

— S i (0 H… (IV) A solution (1) was prepared by dissolving the perfluoropolyether compound (IV) in a fluorine-based solvent (PF5052, manufactured by Sumitomo 3M) at a concentration of 0.01% by weight. This solution (1) was applied to a magnetic disk by dipping under the same conditions as in Example 1, dried sufficiently, and then heat-treated at 100 ° C. for 2 hours. In this case, the thickness of the lubricating layer is 1.3 nm. The disk manufactured in this manner was subjected to the CSS test and the adhesion test in the same manner as in Example 1. Table 1 shows the results.

[Comparative Example 2]

_{_{_{F (CF 2 CF 2 CF 2}}} 0) n - C 2 F 4 - CONH-C 3 H e

-A solution of perfluoropolyether compound (IV) of Si (0 C ₂ H… (IV) dissolved in a fluorine-based solvent (PF5052, manufactured by Sumitomo 3M) at a concentration of 0.01 wt% (1) This solution (1) was applied to a magnetic disk by dipping under the same conditions as in Example 1, dried sufficiently, and then heat-treated at 100 ° C. for 2 hours. The following structural formula (H) used in Example 1

F (CF ₂ CF ₂ CF _z O) _n -C ₂ F, -COO ~ ^T NH ₃ -C ₆ H ₄ -0 -C ₆ H ₅ … (XI) A solution (2) was prepared by dissolving it in a fluorine-based solvent (PF5052, manufactured by Sumitomo 3M) at a concentration of 0.01 wt%. This solution (2) was applied to a magnetic disk by dipping under the same conditions as in Example 1. The thickness of the lubrication layer in both the data area and the CSS area is 2.7 nm. The disk manufactured in this manner was subjected to the CSS test and the adhesion test in the same manner as in Example 1. Table 1 shows the results. [Comparative Example 3]

The same sputtered magnetic disk as in Example 1 was prepared. Next, the following structural formula (VI) used in Example 2 was used.

(C ₂ H ₆ 〇) ₃ S i-C ₃ H ₆ -NHC O- (CF _z CF _a O) _m

_{_{- (CF 2 0) n -}} C 0N H - C 3 H e - S i (OC, H 6) 3 ... 0 perfluoropolyether compound (VI) in the same fluorinated solvent as in Example 1 (VI) A solution dissolved at 0.05 wt% was prepared, dip coated under the same conditions, heat-treated at 110 ° C. for 2 hours, and then the entire surface was washed with the same fluorine-based solvent.

Next, the following structural formula (W) used in Example 2

_{_{_{F (CF 2 CF 2 CF 2}}} - 0) n - and CH ₂ OH ... perfluoropolyether compound (VI) is 0. 0 0 7 wt% dissolved in the fluorine-based solvent (VI) - C ₂ F _< A solution was prepared, applied in the same manner as in Example 1, and only the data area was washed with the same fluorine-based solvent. The thickness of the lubrication layer in the data area is 0.75M, and the thickness of the lubrication layer in the CSS area is 1.84 nm. A CSS test and an adhesion test were performed on the disk thus manufactured in the same manner as in Example 1. Table 1 shows the results.

[Comparative Example 4]

The same sputtered magnetic disk as in Example 1 was prepared. Next, the following structural formula (xm) used in Example 3

H ₂ (CF ₂ CF ₂ 0) _m — (CF ₂ 0) _n … (Xffl)

A perfluoropolyether compound (Xffl) was dissolved in the same fluorine-based solvent as in Example 1 at a concentration of 0.005 wt%, and a dip was applied under the same conditions, followed by heat treatment at 110 ° C for 2 hours. After that, the entire surface was washed with the same fluorine-based solvent.

Next, the following structural formula (W) used in Example 3

_{_{C e H 5 - 0 - C}} e H, - H 3 N + _〇 C_〇 one (CF ₂ CF ₂ 〇) _m

_{_{- (CF 2 0) n -}} COO- + NH 3 - C B H 4 - O - C 6 H 5 ··· () perfluoropolyether compound (W) in the fluorinated solvent of 0.0 0 7 wt% A dissolved solution was prepared and applied to the entire surface of the disk in the same manner as in Example 3. The thickness of the lubricant layer in both the data area and the CSS area is 2.31 nm. The disk manufactured in this manner was subjected to the CSS test and the adhesion test in the same manner as in Example 1. Table 1 shows the results.

(Comparative Example 5)

The magnetic disk manufactured in Comparative Example 2 was mounted on a 3.5-inch magnetic recording / reproducing apparatus with the magnetic disk manufactured in Example 1, and the power was temporarily turned off during operation, the apparatus was forcibly stopped, and left for 24 hours. Later, it was restarted. As a result, as described above, the magnetic recording / reproducing apparatus of this comparative example could not be started, and recording / reproducing became impossible. This is because strong adhesion between the head slider and the disk occurred due to the presence of many weakly adsorbed lubricants in the data area.

Claims

The scope of the claims

1. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a nonmagnetic substrate, the roughness of the surface of the protective film where the magnetic head slider is located when the magnetic disk starts and stops rotating. Is not less than Ra1Onm

A CSS area; and a data area in which the surface of the protective film on which the magnetic head slider 1 is located during rotation of the magnetic disk has a roughness of Ra 3 nm or less. ) ~ (! Π)

R 1-X- (CF ₂ CF ₂₀ ) _m- (CF ₂₀ ) _n -X- R 2… (I)

_{_{_{F (CF 2 CF 2 CF 3}}} - 0) n - C 2 F 4 - X- R 3 ... (Π)

_{F - (CF (CF a)} - CF 2 - 0) n - CF (CF 3) -X- R 4 ··· (HI) ( where, m, n are integers, R l, R 2, R 3, R 4 is a hydrocarbon chain, and X is a divalent linking group), and a lubricating film containing at least one or more perfluoropolyether compounds represented by the following formula is formed. It is composed of a fixed lubricant and a weakly fixed lubricant, and the ratio of the weakly fixed lubricant of the lubricant film formed in the CSS region is 10% with respect to the total amount of the lubricant in the CSS region. The magnetic disk according to the above, wherein the ratio of the lubricant for fixing the lubricating film formed in the data area is less than 10% with respect to the total amount of the lubricant in the data area.

2. The lubricating film is composed of a lubricant that is firmly fixed to the surface of the protective film without being washed and removed with a perfluorocarbon solvent and a weakly fixed lubricant that is washed and removed with a perfluorocarbon solvent. The magnetic disk according to claim 1, wherein:

3. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the surface roughness of the protective film where the magnetic head slider is located when the magnetic disk starts and stops rotating. Is Ra 10 nm or more a css area; and a data area in which the surface of the protective film on which the magnetic head slider 1 is positioned during rotation of the magnetic disk has a roughness of Ra 3 nm or less. ) ~ (! Π)

R 1-X- (CF ₂ CF ₂₀ ) _m- (CF ₂₀ ) nX- R 2… (I)

_{_{_{F (CF 2 CF 2 CF 2}}} -0) n - C 2 F, -X- R 3 · '· (Π) F - (CF (CF 3) -CF 2 - 0) "- CF (CF 3) - X-R… (m) (where m and n are integers, R l, R 2, R 3 and R 4 are hydrocarbon chains, and X is a divalent linking group). After applying a lubricant containing at least one of the following to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or more, or the entire surface or the data area is irradiated with ultraviolet rays, and then the CSS area is By cleaning with a fluorocarbon solvent, a lubricating film having a thickness of 1.5 nm or more formed in the CSS region and a lubricating film having a thickness of 1 nm or more formed in the data region are provided. Magnetic disk.

4. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the surface of the protective film on which the magnetic head slider 1 is located when the magnetic disk starts rotating and stops rotating. A CSS region having a roughness of Ra 10 nm or more, and a data region having a roughness of Ra 3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk. The following general formulas (I) to (! D)

R 1 — X-(CF ₂ CF ₂₀ ). , One (CF ₂ 0) _n -X—R 2… (I)

F (CF ₂ CF ₂ CF ₂ -0) _n -C ₂ F, -X- R 3-(Π)

_{F - (CF (CF 3)} - CF 2 - 0) n -CF (CF 3) -X- R 4 ... (m) ( where, m, n are integers, R l, R 2, R 3, R 4 Is a hydrocarbon chain, and X is a divalent linking group). After applying a lubricant containing at least one to the entire surface of the magnetic disk, the entire surface of the magnetic disk is ripened to 80 ° C. or higher, or the entire surface or the data area is irradiated with ultraviolet rays. After washing with a solvent, a perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds represented by the above general formulas (I) to (! に) in the CSS region. A lubricating film having a thickness of 1.5 nm or more formed in the CSS region and a lubricating film having a thickness of 1 nm or more formed in the data region. .

5. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the roughness of the surface of the protective film where the magnetic head slider is located when the magnetic disk starts and stops rotating. A data area where the roughness of the surface of the protective film on which the magnetic head slider 1 is located during rotation of the magnetic disk is less than Ra 3 nm. The following general formulas (I) to (! Π)

R 1-X- (CF _? CF ₂₀ ) _ro- (CF _i O) _n -X- R 2… (I)

_{_{_{F (CF 2 CF i CF 2}}} - 0) n - C 2 F, - X- R 3 - (Π)

F-(CF (CF ₃ )-CF,-0) _n -CF (CF ₃ )-X-R 4 (m) (where m and n are integers, R l, R 2, R 3, R 4 is a hydrocarbon chain, and X is a divalent linking group) After applying a lubricant containing at least one or more perfluoropolyether compounds represented by Heat to 80 ° C. or higher, or irradiate the entire surface of the magnetic disk or the data area with ultraviolet rays, and then wash the entire surface of the magnetic disk with a perfluorocarbon-based solvent. )

And (m) a perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compounds. A magnetic disk comprising: a lubricant film having a thickness of 1.5 nm or more formed in the CSS region by applying an object; and a lubricant film having a thickness of 1 nm or more formed in the data region.

6. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, a rough surface of the protective film where the magnetic head slider is located when the magnetic disk starts rotating and stops rotating. A CSS region having a roughness of Ra 10 nm or more, and a data region having a roughness of Ra 3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk. The following general formulas (I) to (! Π) are formed on the surface of the protective film.

R 1-X- (CF ₂ CF ₂₀ ) _m- (CF _z O) _n -X- R 2… (I)

F (CF ₂ CF ₂ CF _z -0) _n -C ₂ F ₄ -X- R 3-"(Π)

_{F - (CF (CF 3)} -CF 2 - 0) n - CF (CF 3) - X- R 4 ... (ΙΠ) ( where, m, n are integers, R l, R 2, R 3, R 4 Is a hydrocarbon chain, and X is a divalent bonding group). A lubricant containing at least one perfluoropolyether compound having a functional group chemically reacting with the surface of the protective film represented by After coating the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or higher, or the entire surface or the data area is irradiated with ultraviolet light, and then the entire surface of the magnetic disk is washed with a perfluorocarbon solvent. In the data region, a perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compounds represented by the general formulas (1) to (! Π) is used. By applying, a lubricating film with a thickness of 1.5 nm or more formed in the CSS area and the data area A magnetic disk comprising a formed lubricating film having a thickness of 1 nm or more.

7. In a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, the magnetic disk starts and stops rotating. The surface area of the protective film where the magnetic head slider is located when the magnetic head is stopped, and a surface area where the magnetic head slider is located during rotation of the magnetic disk. A data region having a roughness of Ra 3 nm or less is formed, and then the following general formulas (I) to (! □) R 1 -X- (CF ₂ CF ₂₀ ) _ni- (CF ₂ 0) _n -X-R 2… (I)

_{_{F (CF CF 2 CF 2 -}} ! 0) n - C i F 4 -X- R 3 - (Π)

F— (CF (CF ₃ )-CF ₂ —〇) _n — CF (CF ₃ )-X—R 4… (ΙΠ) (where m and n are integers, R l, R 2, R 3 and R 4 Is a hydrocarbon chain, and X is a divalent linking group). A lubricant containing at least one perfluoropolyether compound represented by the following formula is applied to the entire surface of the magnetic disk. By heating to 0 ° C or more or irradiating the entire surface of the magnetic disk or the data area with ultraviolet rays, and then washing the CSS area with a perfluorocarbon-based solvent, the CSS area is not less than 1.5ηπι A method for manufacturing a magnetic disk, comprising: forming a lubricating film having a film thickness; and forming a lubricating film having a film thickness of at least inm in the data area.

8. The method of manufacturing a magnetic disk according to claim 7, wherein after cleaning the entire surface of the magnetic disk with a fluorocarbon-based solvent, the pars of the general formulas (I) to (! Π) are added to the CSS region. A perfluoropolyether compound having an adsorptive functional group selected from a fluoropolyether compound is applied to form a lubricating film having a thickness of 1.5 nm or more in the CSS region. A method for manufacturing a magnetic disk, comprising forming a lubricating film having a thickness of 1 nm or more in a region.

9. The method for manufacturing a magnetic disk according to claim 7, wherein the entire surface of the magnetic disk is washed with a perfluorocarbon-based solvent, and then the perfluoropolyether-based compound represented by any of the general formulas (I) to (!！) is used. Selected from the above A perfluoropolyether compound having a functional group that chemically reacts with the protective film surface is applied, a lubricating film having a thickness of 1.5 nm or more is formed in the CSS region, and a film thickness of 1 nm or more is formed in the data region. A method for manufacturing a magnetic disk, comprising: forming a lubricating film.

10. The method of manufacturing a magnetic disk according to claim 7, wherein the entire surface of the magnetic disk is heated to 80 ° C. or higher or irradiated with ultraviolet light, and then the magnetic head of any of the above general formulas (I) to (! Π) is used. After applying a perfluoropolyether compound having an adsorptive functional group selected from a perfluoropolyether compound to the entire surface of the magnetic disk, and then cleaning the data area with a perfluorocarbon solvent, A perfluoropolyether compound having a chemically reactive functional group selected from the perfluoropolyether compounds of formulas (I) to (! Π) is applied, and a lubricating film having a thickness of 1.5 nm or more is formed on the CSS region. Forming a lubricating film having a thickness of 1 nm or more in the data area.

1 1. A magnetic recording / reproducing apparatus equipped with a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate. Wherein the magnetic disk has a CSS region in which the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra 10 nm or more when the magnetic disk starts and stops rotating, and the magnetic disk The surface of the protective film on which the magnetic head slider 1 is located during the rotation of the magnetic head has a data area having a roughness of Ra 3 nm or less.

(I)-(ΙΠ)

R 1 — X-(CCF ₂ 〇) „(CF ₂₀ ) _n -X—R 2… (I)

_{_{_{F (CF 2 CF 2 CF 2}}} - 0) n - C 2 F 4 -X- R 3 ... (Π)

F— (CF (CF ₃ ) — CF ₂ — 0) _n — CF (C FJ— X— R 4… (ΠΙ) (Where m and n are integers, R l, R 2, R 3, and R 4 are hydrocarbon chains, and X is a divalent linking group). A lubricating film including a lubricant firmly fixed to the surface of the protective film and a lubricant weakly fixed to the surface of the protective film, wherein the lubricating film formed in the CSS region is weakly fixed. The ratio of the lubricant is 10% or more with respect to the total amount of the lubricant in the CSS region, and the ratio of the weakly fixed lubricant of the lubricant film formed in the data region is equal to the total amount of the lubricant in the data region. The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1.0 or less in the data area. Maximum static friction coefficient generated between the magnetic head slider and the magnetic disk 1.0, the magnetic recording and reproducing apparatus kinetic friction coefficient is equal to or more than 0.5.

1 2. In a magnetic recording / reproducing apparatus including a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially stacked on a non-magnetic substrate, When the magnetic disk starts and stops rotating, the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra10 nm or more, and the magnetic disk is rotating. The surface of the protective film where the magnetic head slider 1 is located has a data region with a roughness of Ra 3 nm or less.

(I)-(m)

R 1-X- (CF ₂ CF ₂₀ ) _ni- (CF ₂₀ ),-X- R 2… (I)

F (CF, CF ₂ CF ₂ _ 0) _n -C ₂ F, — X-R 3… (Π)

_{F - (CF (CF 3)} - CF 2 - 0) n - CF (CF 3) -X- R 4 ... (m) ( where, m, n are integers, R l, R 2, R 3, R 4 Is a hydrocarbon chain, and X is a divalent linking group). After applying one or more over the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated at 80 ° C. or higher, or the entire surface of the magnetic disk or the data region is irradiated with ultraviolet light, and then the data region is exposed with a perfluorocarbon solvent. After the cleaning, the lubricating film formed in the CSS region has a thickness of 1.5 nm or more, the lubricating film formed in the data region has a thickness of 1 nm or more, and the magnetic head slider has a thickness of 1 nm or more in the data region. The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the CSS area is 1.5 or less, and the maximum static friction coefficient generated between the magnetic disk and the magnetic disk is 1 or less. A magnetic recording / reproducing apparatus characterized by having a dynamic friction coefficient of 0.5 or less and a dynamic friction coefficient of 0.5 or less.

13. The magnetic recording / reproducing apparatus according to claim 12, wherein the magnetic disk cleans the data area with a perfluorocarbon-based solvent, and then adds the general formulas (i) to (m) to the CSS area. The perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds represented by the formula (1) is applied, and the lubricating film formed in the CSS region has a thickness of 1.5 nm or more. A magnetic recording / reproducing apparatus, wherein the lubricating film formed in the data area has a thickness of 1 nm or more.

14. The magnetic recording / reproducing apparatus according to claim 12, wherein the magnetic disk force and the data area are cleaned with a perfluorocarbon-based solvent, and then the general formulas (I) to (I) are applied to the entire surface of the magnetic disk. Π) A perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compound represented by the formula (1) is applied, and the lubricating film formed in the CSS region is formed by the following method. A magnetic recording / reproducing apparatus having a thickness of at least 5 nm and a thickness of the moisture film formed in the data area of at least 1 nm.

1 5. A magnetic recording / reproducing apparatus including a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially stacked on a non-magnetic substrate. Wherein the magnetic disk has a CSS region in which the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra 10 nm or more when the magnetic disk starts and stops rotating, and the magnetic disk The surface of the protective film on which the magnetic head slider 1 is located during the rotation of the magnetic head has a data area having a roughness of Ra 3 nm or less.

(I)-(m)

R l-X- (CF ₂ CF ₂ 0) _m- (CF _? 0) _n -X- R 2… (I)

_{_{_{F (CF 2 CF 2 CF 2}}} - 0) n - C i F 4 -X- R 3 - (Π)

_{F - (CF (CF 3)} - CF 2 - 0) n- CF (CF a) - X- R 4 ... (ΙΠ) ( where, m, n are integers, R l, R 2, R 3, R 4 Is a hydrocarbon chain, and X is a divalent linking group). At least one or more perfluoropolyether compounds represented by the following formulas are applied to the entire surface of the magnetic disk, and the entire surface of the magnetic disk is heated at 80 ° C or higher. Alternatively, the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays, and a perfluoropolyether having an adsorptive functional group selected from the perfluoropolyether compounds represented by the general formulas (I) to (!). A system compound is applied to the entire surface of the magnetic disk, and the data region is washed with a perfluorocarbon solvent, and then selected from the perfluoropolyether compounds represented by the general formulas (I) to (ΙΠ). Perfluorinated polyethers with chemically reactive functional groups The lubricating film formed in the CSS region has a thickness of 1.5 nm or more, and the lubricating film formed in the data region has a thickness of 1 nm or more. The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk is 1.5 or less, and the dynamic friction coefficient is 1.0 or less. A magnetic recording / reproducing apparatus characterized in that the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk is 1.0 or less and the dynamic friction coefficient is 0.5 or less.

1 6. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the magnetic head slider is located on the surface of the protective film where the magnetic head slider 1 is positioned when the magnetic disk starts rotating and stops rotating. A CSS area having a roughness of Ra 10 nm or more; and a data area having a roughness of Ra 3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk. The following general formulas (IV) to (Xffl)

_{_{_{F (CF 2 CF 2 CF 2}}} 0) n - C 2 F 4 - C 0NH - C 3 H t

— S i (0 C ₂ H ··· (IV)

F (CF (C FJ- CF _i O) _n -CF (C FJ- C ONH-C ₃ H ₆

— S i (OC _z H… (V)

(C, H. 0) ₃ S i-C ₃ H _E -NH CO- (CF ₂ CF ₂₀ ) _m

-(CF ₂ 0) _n -C0NH-C ₃ H ₆ -S i (0 C ₂ H ₆ ) ₃ … (VI) C ₆ H,-O-C ₆ H ₄ -H ₃ N ⁺ "0 C 0- (CF ₂ CF ₂ 0) _m

-(CF, 0) „-CO O" + NH _a — Cs —〇C _s H. _{... () F (CF J CF} , CF 2 - 0) "- C 2 F 4 - CH i 0H ... (VII)

_{_{H 0- CH J - (CF 2}} CF J 0) m - (CF 2 0) n - CH 2 0H ··· (DC) H O- (CH 2 CH 2 - 0) - CH 2 CF 2 - (CF ₂ CF ₂ 0) _m

One (CF ₂ 0) _n —〇 CF, CH O-CH ₂ CH ー OH… (X) F (CF ₂ CF, CF ₂₀ ) 0- C _J F _< -C 00 "+ NH ₃ — C _E H ₄ —〇

-C _e H ₅ … (XI)

_{F (CF (CF a) -} CF 2 0) n - CF (CF 3) - C00 "+ NH a

_{_{- C 6 H 4 - 0- C}} E H 6 ··· (ΧΠ)

(Where m, n, p, and q are integers) after applying a lubricant containing at least one or more perfluoropolyether compounds to the entire surface of the magnetic disk, By heating to 0 ° C or higher or irradiating the entire surface of the magnetic disk or the data area with ultraviolet rays, and then cleaning the CSS area with a perfluorocarbon-based solvent, a film thickness of 1.5 nm or more formed in the CSS area. magnetic disks _t of the lubricating film and a lubricant film having a thickness of 1 nm or more formed in the data area, comprising the

1 7. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the surface roughness of the protective film where the magnetic head slider is located when the magnetic disk starts and stops rotating. And a data area having a roughness of Ra 3 II iu or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk. The following general formulas (IV) to (XDI)

F (CF ₂ CF ₂ CF _z 0) _n -C ₂ F _4- C 0 NH- C ₃ H ₆

-S i (OC ₂ HJ ₃ … (IV)

F (CF (CF ₃ )-CF ₂₀ ), ₁ -CF (CF ₃ )-C ONH- C ₃ H _E

One S i (0 C ₂ H… (V)

(C ₂ H ₅ 0) ₃ S i — C _a H _E -NHCO— (CF ₂ CF ₂₀ ) _m

One (CF ₂ 0) _n — C 0 NH — C ₃ H _s — S i (〇 C ₂ H.) ₃ … (VI)

_{_{_{C 6 H 6 - 0- C e}}} H, - H 3 N + one _{_{OC O- (CF 2 CF 2 0}} ) -(CF ₂ 0) n-COO " ⁺ NH ₃ -C _E H ₄ -O-C ₆ H ₆ … (VE) F (CF ₂ CF ₂ CF ₂ -0) _n -C _i F ₄ -CH _i 0H … (VI)

H O- CH _2- (CF ₂ CF ₂ 0) _m- (CF ₂ 0) n- CH ₂ OH… (K) H 0- (CH _i CH ₂ -0) _P -CH ₂ CF _J- (CF ₂ CF ₂ 〇) _m

-(CF ₂ 0) _n -0C F ₂ CH ₂ (0-CH ₂ CH ₂ ) _q -0H… (X) F (CF ₂ CF ₂ CF ₂ 〇) _n — C ₂ F ₄ — CO O— + NH ₃ — C _S H, — 0

― C _B H ₆ ■ (XI)

F (CF (CF ₃ ) -CF ₂₀ ) _n -CF (CF ₃ )-C 00- ⁺ NH ₃

-C _e H,-0- C ₆ H _B

_H

(Where m, n, p, and q are integers) after applying a lubricant containing at least one or more perfluoropolyether-based compounds to the entire surface of the magnetic disk, ° C or by irradiating the entire surface of the magnetic disk or the data region with ultraviolet rays, and then cleaning the entire surface of the magnetic disk with a perfluorocarbon-based solvent, and applying the above general formulas (VII) to (VII) to the CSS region. Xffl) is coated with a perfluoropolyether compound having an adsorptive functional group selected from perfluoropolyether compounds. A lubricating film with a thickness of 1.5 nm or more formed in the CSS region and the data A magnetic disk comprising a lubricating film having a thickness of 1 nm or more formed in a region.

1 8. A magnetic layer in which an underlayer, a magnetic layer, and a protective layer are sequentially stacked on a non-magnetic substrate. In the disk, a CSS region in which the surface of the protective film on which the magnetic head slider 1 is located when the rotation of the magnetic disk is started and stopped is Ra 10 nm or more; The surface of the protective film on which the magnetic head slider 1 is located has a data area with a roughness of Ra 3 nm or less, and the surface of the protective film has the following general formula (IV) to (xm).

_{_{F (CF 2 CF 2 CF,}} 0) n - C 2 F, - CONH - C 3 H e

_ S i (OH.) ₃ … (IV)

F (CF (CF ₃ )-CF ₂₀ ) _n -CF (C FJ-C 0 NH-C _{3 He} _e S i (〇 C ₂ H… (V)

(C ₂ H _S 〇) ₃ S i-C ₃ H ₆ -NHCO-(CF ₂ CF ₂₀ ) _m

One _{_{(CF 2 0) n - CONH-}} C 3 H e - S i (OC 2 H ... (VI)

C _E H ₅ -O-C _e H ₄ -H ₃ N ⁺ — 0 C〇-(CF ₂ CF ₂₀ ) _m

One (CF ₂ 0) _n - C_〇_〇 one ^{_{_{_{+ NH a - C e H 4}}}} - 0 - C 8 H 6 ... (H) F (CF 2 CF 2 CF 2 - 0) n - C 2 F 4 - CH ₂ 0 H

_{_{H 0- CH 2 - (CF 2}} CF 2 O one (CF ₂ _{_{〇) n - CH 2 0 H ...}} (DC) HO - (CH 2 CH 2 - 0) p - CH 2 CF 2 - (CF 2 CF 2 0) _m

-(CF ₂ 0) _n -0 CF, CH ₂ (0-CH ₂ CH ₂ ) _¾ -0 H ... (X) FC Fz C Fz C Fi O) ,,-C ₂ F * — COO— ⁺ _{_{_{NH 3 - C 6 H 4 -}}} 0 one H ₆ ··· (XI)

F (CF (CF ₃ )-CF _? 0) _n -CF (CF ₃ )-C 00 ^{_ +} NH ₃

— C _e H ₄ -O— H. … (ΧΠ)

_H- (CF ₂ CF ₂₀ ) _m- (CF ₂₀ )

One _H ... ■ (XII)

(Where m, n, p, and q are integers) after applying a lubricant containing at least one or more perfluoropolyether-based compound to the entire surface of the magnetic disk, ° C or by irradiating the entire surface of the magnetic disk or the data area with ultraviolet rays, and then cleaning the data area with a carbon-based solvent having a perfluoro opening, and applying the general formulas (I) to (! Π) to the data area. A lubricating film having a thickness of 1.5 nm or more formed in the CSS region by applying a perfluoropolyether compound having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compound selected from And a lubricating film having a thickness of 1 nm or more formed in the data area.

1 9. In a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate, the magnetic head slider is located on the surface of the protective film where the magnetic head slider 1 is positioned when the magnetic disk starts and stops rotating. A CSS area having a roughness of Ra 10 nm or more; and a data area having a roughness of Ra 3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk. The following general formulas (IV) to (VI) are formed on the surface of the protective film.

_{_{_{F (CF 2 CF 2 CF 2}}} 0) "- C 2 F 4 - C 0NH- C 3 H e

-S i (0 C ₂ HJ ₃ … (IV)

_{F (CF (CF 3) -} CF 2 0) n - CF (CF a) - CONH- C 3 H 6 one S i (〇 C ₂ H ·· - (V)

_{_{_{(C 2 H 5 0) 3}}} S i - C 3 H 6 - NH C O- (CF 2 CF 2 0) m

-(CF, 0) _n -C 0 NH-C ₃ H _B -S i (OC ₂ H ₅ ) ₃ … (VI) (where m and n are integers) After applying a lubricant containing at least one of them to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or more, or The surface or the data area is irradiated with ultraviolet light, and then the following general formulas (VH) to (Xffl)

_{_{_{C e H 5 - 0C e H}}} 4 - H 3 N + "0C 0- (CF 2 CF 2 0) m

_{_{- (CF z 0) n -}} C 00 "+ NH 3 - C B H, - 0 - C e H 5 - () F (CF 2 CF 2 CF 2 - 0) n- C 2 F 4 -CH 2 OH … (VI)

H O- CH _2- (CF ₂ CF _i O) _m- (CF ₂ 0) _n -CH ₂ OH… (K) H O- (CH ₂ CH ₂ -0) _P -CH ₂ CF _2- (CF ₂ CF ₂ 〇) _ra

-(CF ₂ 0) _n -OCF _? CH ₂ (0- CH _z CH ₂ ) _q -OH… (X) F (CF ₂ CF ₂ CF ₂ 0) _n -C ₂ F,-C00 ~ + NH ₃ — C _S H, —〇 — H ₅ … (XI)

F (CF (CF ₃ ) -CF ₂₀ ) n-CF (CF ₃ ) -C OO ^_ + NH

_{_{- C 6 H 4 - 0- C}} 6 H (M)

H ₂

(Where m, n, p, and q are integers) a perfluoropolyether compound having an adsorptive functional group selected from perfluoropolyether compounds represented by the following formulas: Next, the data area is washed with a perfluorocarbon-based solvent, and then a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether-based compounds represented by the general formulas (IV) to (V1). A lubricating film having a thickness of 1.5 nm or more formed in the CSS region and a lubricating film having a thickness of 1 nm or more formed in the data region. Characterized by magnetism disk.

20. In a method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, a magnetic head slider is positioned when the magnetic disk starts rotating and stops rotating. A CSS region where the surface roughness of the protective film is Ra10 nm or more; and a data area where the surface roughness of the protective film where the magnetic head slider 1 is positioned during rotation of the magnetic disk is Ra3 nm or less. And the following general formulas (IV) to (Xffl) F (CF ₂ CF _z CF ₂₀ ) _n -C ₂ F,-C ON H-C ₃ H _E

— S i (OC ₂ H ··· (IV)

_{F (CF (CF 3) -} CF 2 _{_{〇) n - CF (CF 3)}} - C ON H- C 3 H e

-S i (0 C ₂ HJ ₃

(C ₂ H ₆₀ ) ₃ S i-C ₃ H ₆ -NH CO- (CF ₂ CF ₂₀ ) _m

- (CF ₂ _{_{〇) n - C ONH- C 3 H}} E - S i ( 〇 _{_{_{C 2 H 5) 3 ... (}}} VI) C e H 5 - 0- C c H 4 -H 3 N + ~ OC O- (CF ₂ CF ₂ 0) _m

One (CF ₂ _{^{_{〇) n - C 00- + NH 3}}} - C e H 4 - 0- C 6 H s ... () F (CF 2 CF 2 CF 2 - 0) n - C 2 F, -? CH OH … (VI)

_{H O- CH 2 - (CF,} CF 2 0) ro - (CF 2 0) I, - CH 2 0 H ... (IX) H_〇- _{_{(CH 2 CH 2 - 0)}} D - CH 2 CF 2 - ( CF ₂ CF ₂ 0) „

— (CF ₂ 〇) _n — 0 CF ₂ CH ₂ (0— CH ₂ CH ー OH… (X)

F (CF ₂ CF ₂ CF _z 0) _r.- C ₂ F ₄ -C 00 'NH ₃ -C ₆ H,-0-1 H ₅ … (XI)

-+

F (CF (C FJ- CF ₂₀ ) _n -CF (CF ₃ )-C 00 NH

_{_{- C K H 4 - 0 -}} C E H 6 (ΧΠ)

, Z

_{_{_{? H CCH 2 0 CH 2 0-}}} (CF 2 CF 2 0) n - (CF 2 0) nヽXX

(Where m, n, p, and q are integers) after applying a lubricant containing at least one or more perfluoropolyether-based compound to the entire surface of the magnetic disk, ° C or more, or irradiate the entire surface of the magnetic disk or the data area with ultraviolet rays, then wash the data area with a perfluorocarbon solvent, and apply a lubricating film with a thickness of 1.5 mn or more to the CSS area. Forming a lubricating film having a thickness of 1 nm or more in the data area.

2 1. A method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. The roughness of the protective film surface is Ra

Forming a CSS region having a thickness of 10 nm or more and a data region having a roughness of Ra 3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk; The following general formulas (IV) to (xm)

_{_{_{F (CF 2 CF 2 CF z}}} 0) n - C 2 F 4 - C0NH - C 3 H e

One S i (〇 C ₂ H… (IV) F (CF (C FJ-CF, 0) _n -CF (CF ₃ )-C〇NH— C ₃ H _S

One S丄(◦ C, H ... (V ) (C 2 H 5 0) 3 S i - C 3 H 6 - NH CO- (CF 2 CF 2 0) m

-(CF ₂ 0) _n -C 0 NH-C ₃ H ₆ -S i (OC ₂ Hj ₃ … (VI) C _E H ₆ -O-C ₆ H ₄ -H, N ⁺ one C〇 one (CF ₂ CF ₂ 0) _m

_{_{- (CF 2 0) n -}} C OO "+ NH a -C e H 4 - 0- C e H 5 ... ()

_{F (CF CF CF - 0?} ??); -? C 7 F 4 - CH 0H ... (VI) H 0- CH _2- (CF ₂ CF _z 0) _m- (CF ₂ 0) _n -CH _i 0H ··· (DC) H〇 (CH ₂ CH ₂ —〇) _p — CH ₂ CF ₂ — ( CF ₂ CF ₂ 0) _m

One (CF ₂ 0) _n —〇 CF ₂ CH ₂ (〇One CH ₂ CH ₂ ) _q —〇 H… (X) F (CF ₂ CF ₂ CF ₂₀ ) _n -C ₂ F ₄ -C 00 ~ + NH ₃ — C _S H ₄ — 0

-C ₆ H ₅ … (XI)

F (CF (CF ₃ )-CF, 〇) _n -CF (CF ₃ )-C OO ⁺ NH ₃

_{_{- C e H 4 - 0- C}} 6 H 5 ... ()

_HH

(Where m, n, p, and q are integers) after applying a lubricant containing at least one or more perfluoropolyether-based compounds to the entire surface of the magnetic disk, ° C or above, or the entire surface of the magnetic disk or the data area is irradiated with ultraviolet rays, and then the entire surface of the magnetic disk is washed with a perfluorocarbon-based solvent. (Xm) a perfluoropolyether compound having an adsorptive functional group selected from the perfluoropolyether compounds of (xm), and a lubricating film having a thickness of 1.5 nm or more is formed in the CSS region; A method for manufacturing a magnetic disk, comprising forming a lubricating film having a thickness of 1 nm or more in a data area.

2 2. A method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts and stops rotating. The roughness of the protective film surface Forming a CSS region with Ra1 O nm or more and a data region with a roughness of Ra3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk; said protective layer surface by the following general formula (IV) ~ (ΧΙΕ) F in _{_{_{(CF 2 CF J CF i O}}} ) n- C 2 F 4 - CONH- C 3 H e

One S i (0 C ₂ HJ _3- (IV)

F (CF (C FJ-CF ₂ 0) _n — CF (C FJ— C ONH-C ₃ H _S

— S i (〇 C ₂ H… (V)

_{_{(C 2 H, 0) 3}} S i - C 3 H e -NHC0- (CF J CF 2 0) m

-(CF ₂ 0) _n -C 0 H-C ₃ H ₆ -S i (0 C ₂ HJ ₃ … (VI) C ₆ H ₅ -0- C _E H ₄ -H ₃ N ⁺ "0C 0- ( CF ₂ CF ₂ 0) _m

_{_{- (CF 2 0) n -}} COO "+ NH 3 - C E H 4 - O - C 6 H 6 ... (W) F (CF 2 CF 2 CF 2 - 0) n - C 2 F 4 - CH 2 OH … (VI)

H 0-CH,-(CF ₂ CF ₂ 0) _m- (CF ₂ 0) _n -CH _i 0H… (IX) H〇— (CH ₂ CH ₂ — 0) _P — CH ₂ CF ₂ — (CF ₂ CF ₂ 0) _m

-(CF ₂ 0) _n -0C F ₂ CH ₂ (0- CH ₂ C HJ _q -0H… (X) F (CF ₂ CF ₂ CF ₂ 0) „-C ₂ F ₄ -C 00" ⁺ NH ₃ - C ₆ H ₄ - 0

-C _e H ₆ … (XI)

_{F (CF (CF a) -} CF 2 0) n - CF (CF 3) - C 00 "+ NH 3

_{_{- C 6 H 4 - 0 -}} C 6 H 5 ... (ΧΠ) CF 2 CF 2 0) m - (CF i 0) n ... (Xffl)

(However, m, n, p, and q are integers) After applying a lubricant containing at least one compound to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C. or higher, or ultraviolet light is applied to the entire surface of the magnetic disk or the data region. Next, the entire surface of the magnetic disk is washed with a perfluorocarbon-based solvent, and the data area is chemically treated with the surface of the protective film selected from the perfluoropolyether-based compounds represented by the general formulas (IV) to (VI). Apply a perfluoropolyether compound having a reactive functional group, form a lubricating film with a thickness of 1.5 nm or more in the CSS area, and form a lubricating film with a thickness of 1 nm or more in the data area. A method of manufacturing a magnetic disk.

2 3. A method for manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially laminated on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts rotating and stops rotating. The roughness of the protective film surface

Forming a CSS region having a Ra of 10 nm or more and a data region having a roughness of Ra 3 nm or less on the surface of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk; On the surface of the protective film, the following general formulas (IV) to (VI) F (CF ₂ CF ₂ CF ₂ 〇—C ₂ F, — C ON H—C ₃ H _S

-S i (0 C, H-(IV)

F (CF (CF ₃ ) —CF ₂ 0) _n — CF (CF ₃ )-C ONH-C ₃ H _S

— S i (〇 C ₂ H… (V)

(C ₂ H ₅ 〇) ₃ Si-C ₃ H ₆ -NHCO- (CF ₂ CF ₂₀ ).

-(CF _J 0),-CO NH -C ₃ H ₆ -S i (0C ₂ HJ ₃ … (VI) (where m and n are integers) selected from perfluoropolyether compounds At least one bar fluoropolyether compound having a functional group that chemically reacts with the surface of the protective film is applied to the entire surface of the magnetic disk, and the entire surface of the magnetic disk is heated at 80 or more, or ultraviolet. After irradiation, the following general formula (VK) ~ (XE1)

_{_{_{C 6 H 5 - 0- C 6}}} H 4 - H 3 N + "0 C 0- (CF 2 CF 2 0) m

- (CF ₂ 0 one C_〇_〇- ^{_{_{_{+ NH 3 - C s H 4}}}} - 0 - C e H 6 ... () F (CF 2 CF 2 CF 2 - 0) n - C 2 F 4 - CH 2 0H ... (VI)

H0-CH _2- (CF ₂ CF ₂ 0) _m- (CF ₂ 0) _n -CH ₂ 0 H… (IX) H O- (CH ₂ CH ₂ -0) _P -CH ₂ CF _2- (CF, CF ₂ 0) _m

_ (CF ₂ 〇) _n — 0 CF ₂ CH 0-CH ₂ CH — 0 H… (X) F CC F. CF ^ F. Ojn- CF- C OO- + NH ₃ -C _e H,-0

-C ₆ H ₆ …) F (CF (CF ₃ )-CF ₂₀ ) _n -CF (CF ₃ )-C 00 "+ NH ₃

— C _E H, — 0— C _S H ··· (ΧΠ)

_H (CF ₂ CF ₂₀ ) _m- (CF ₂₀ )

-… (Xm)

(Where m, n, and pq are integers) a perfluoropolyether compound having an adsorptive functional group selected from perfluoropolyether compounds represented by the following formula: The data area is washed with a perfluorocarbon-based solvent, and then a part having a functional group chemically reactive with the surface of the protective film selected from the perfluoropolyether-based compounds represented by the general formulas (IV) to (VI) is used. A magnetic layer formed by applying a fluoropolyether compound, forming a lubricating film having a thickness of 1.5 nm or more in the CSS region, and forming a lubricating film having a thickness of 1 nm or more in the data region. Disk manufacturing method.

24. A magnetic recording / reproducing apparatus including a magnetic head, a magnetic head slider having a magnetic head mounted thereon, and a magnetic disk having a non-magnetic substrate on which a base film, a magnetic film, and a protective film are laminated in this order. When the magnetic disk starts rotating and stops rotating, the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra10 nm or more, and during rotation of the magnetic disk. The surface of the protective film on which the magnetic head slider 1 is located has a data area with a roughness of Ra 3 nm or less. Then, the following general formulas (IV) to (X)

F (CF ₂ CF ₂ CF _z 0) _n -C ₂ F ₄ -C0 NH- C ₃ H ₆

— S i (0 C ₂ H ··· (IV)

_{F (CF (CF 3) -} CF 2 0) n- CF (CF 3) - C 0NH- C 3 H 6

_ S i (OH.) ₃ … (V)

(C ₂ H _s 0) ₃ S i-C ₃ H _s -NHC O- (CF ₂ CF ₂₀ ) _m

-(CF ₂ 0) _n -C 0 NH-C ₃ H ₆ -S i (OC ₂ H ₆ ) _a … (VI) C _e H ₆ -OU-H ₃ N + — O CO-(CF ₂ CF ₂₀ ) _m

_{_{- (CF 2 0) n -}} C 00 one ^{_{_{+ NH 3 - C e H,}}} - 0- C 6 H 5 ·· ■ (VH) F (CF 2 CF 2 CF 2 - 0) n - C J F 4 - CH ₂ 0 H… (VI)

H O- CH _2- (CF ₂ CF ₂₀ ) _m- (CF ₂ 0) n- CH ₂ OH… (DC) HO— (CH ₂ CH ₂ —〇) _P — CH _Z CF ₂ — (CF, CF ₂ 0).

_ (CF ₂ 〇) _n —〇 CF ₂ CH ₂ (0— CH ₂ CH ₂ ) _q —〇 H (X)

F (CF ₂ CF ₂ CF ₂ 0) _n -C ₂ F,-COO "+ NH _3- H. 0-1 C _c H ₅ (XI)

F (CF (CF ₃ )-CF ₂₀ ) _n -CF (CF ₃ )-C 00 ~ ⁺ NH

_{_{- C e H 4 - 0- C}} e H 6 (ΧΠ) ffl)

(However, m, n, p, and q are integers) After applying at least one or more of the polyfluoropolyether-based compounds to the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C or more. Heating, or irradiating the entire surface of the magnetic disk or the data area with ultraviolet rays, and then cleaning the data area with a carbon-based solvent. The lubricant film formed in the data area has a thickness of 1 nm or more, and the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less. A magnetic recording / reproducing apparatus, wherein a dynamic friction coefficient is 1.0 or less, and a maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the CSS region is 1.0 or less, and a dynamic friction coefficient is 0.5 or less.

2 5. A magnetic recording / reproducing apparatus equipped with a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially laminated on a non-magnetic substrate. In the above, when the magnetic disk starts and stops rotating, the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra 1 O nm or more; The surface of the protective film on which the magnetic head slider 1 is located during the rotation of the magnetic head has a data area with a roughness of Ra 3 nm or less. Then, the following general formulas (IV) to (xm) are provided on the surface of the protective film.

F (CF ₂ CF ₂ CF ₂₀ ) _r .- C ₂ F,-C ONH-C ₃ H ₆ One S i (〇 C ₂ H ₆ ) 3 · '(IV) F (CF (CF ₃ )-CF ₂ 〇) _n — CF (CF ₃ ) — C ONH-C ₃ H

_{- S i (OC 2 H ··} (V) (C 2 H 5 0) 3 S i one _{_{C 3 H e - NHC O- (}} CF 2 CF 2 〇) _ra

_{_{- (CF 2 0) n -}} C 0NH- C 3 H e - S i (OC 2 HJ 3 · '(VI) C E H, - OC E H 4 - H 3 N + - OC 0 - (CF ₂ CF ₂ 0) _m

One (CF ₂ 〇) _n _ C_〇 ^{_{_{0- + NH 3 - C 6 H}}} 4 - 0 - C K H 6 - () F (CF 2 CF 2 CF 2 - 0) n - C 2 F 4 - CH 2 OH ·· (W) HO - CH 2 - (CF 2 CF 2 0) ro - (CF 2 0) n- CH 2 OH '· () H O- (CH z CH 2 - 0) P - CH 2 CF _2- (CF ₂ CF ₂ 0) _m

-(CF ₂ 0) _n -0C F ₂ CH ₂ (0- CH ₂ C HJ _q -0HF (CF ₂ CF ₂ CF ₂₀ ) _n -C ₂ F ₄ -C OO " ⁺ NH ₃ -C _B H. 〇

-C ₆ H _B ... (XI) F (CF (CF ₃ )-CF ₂₀ ) _n -CF (CF ₃ )-C 00 " ⁺ NH ₃

-C ₆ H,-0- C ₆ H ₆

, 0,

₀ ^ x ^ x P CH ₂ 0C H, 0- (CF ₂ CF ₂ 0) _m- (CF ₂ 0) _n

-OCH ₂ OC… (XII)

(However, m, n, p, and q are integers) After applying at least one or more perfluoropolyether-based compounds over the entire surface of the magnetic disk, the entire surface of the magnetic disk is heated to 80 ° C or more. Or irradiating the entire surface of the magnetic disk or the data area with ultraviolet light, and then cleaning the entire surface of the disk with a perforated solvent based solvent. Xffi) The perfluoropolyether compound having an adsorptive functional group selected from the above perfluoropolyether compounds was applied, and the lubricating film formed in the CSS region had a thickness of 1.5 nm or more, and the above data The lubricating film formed in the area has a thickness of 1 nm or more, and the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1. A magnetic recording / reproducing apparatus, wherein the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the CSS area is 1.0 or less and the dynamic friction coefficient is 0.5 or less in the CSS region.

2 6. A magnetic recording / reproducing apparatus equipped with a magnetic head, a magnetic head slider equipped with a magnetic head, and a magnetic disk in which a base film, a magnetic film, and a protective film are sequentially stacked on a non-magnetic substrate. Wherein the magnetic disk has a CSS region in which the surface of the protective film on which the magnetic head slider 1 is located has a roughness of Ra 10 nm or more when the magnetic disk starts and stops rotating, and the magnetic disk The surface of the protective film on which the magnetic head slider 1 is located during the rotation of the magnetic head has a data area with a roughness of Ra 3 nm or less. Then, the following general formulas (IV) to (XE1) are provided on the surface of the protective film.

_{_{_{F (CF 2 CF i CF i}}} O) n - C 2 F <- CO NH - C 3 H s

— S i (OC ₂ H ··· (IV)

F (CF (C FJ— CF ₂ 〇) _n — CF (CF ₃ ) — C〇NH— C ₃ H _S

-S i (OC ₂ H

(C ₂ H ₅ O) S i-C ₃ H _E -NH CO-(CF ₂ CF ₂₀ ) _m

-(CF ₂ 0) _n -C ONH-C ₃ H _E -S i (0 C ₂ HJ ₃

C ₆ H ₅ -O-C _B H ₄ -H ₃ N ⁺ one C one (CF ₂ CF ₂₀ ) _m

_ (CF ₂ O) ,, - CO_〇 one ^{_{_{_{+ NH 3 - C B H 4}}}} - 0- C 6 H 5 ... ()

_{_{F (CF CF 2 CF 2 -}} ? 0) "- C 2 F 4 - CH 2 OH ··· (VI) H_〇 one _{_{_{CH 2 - (CF 2 CF 2}}} 0) m - (CF 2 0) "- CH 2 0 H ··· (DO H 0- (CH 2 CH 2 - 0) P - CH 2 CF -? ( CF ₂ CF ₂ 〇) _ra

One (CF ₂ 〇) _n -0 CF ₂ CH ₂ (O— CH ₂ CH ₂ ) _q -OH (X) F (CF ₂ CF ₂ CF ₂ 0) _n -C ₂ F ₄ -C 00 ~ ⁺ NH ₃ -C _e H,-O

-C _E H ₆ … (XI)

F (CF (CF ₃ )-CF ₂ 〇) _n CF (CF ₃ )-COO— ⁺ NH ₃

-C _e H ₄ -O-C _G H ₅ … (ΧΠ)

_{^{_{H c 0 ^^ [CH 2 OC}}} H 2 0- (CF CF 2 0?) M - (CF 2 0),;

(Where m, n, p, and q are integers) after applying at least one or more perfluoropolyether compounds represented by the following formulas to the entire surface of the magnetic disk, and then heating the entire surface of the magnetic disk at 80 ° C. or more. After heating or irradiating the entire surface of the magnetic disk or the data area with ultraviolet rays, and then cleaning the data area with a carbon-based solvent having a perforated opening, the powders of the general formulas (IV) to (VI) are obtained. perfluoropolyether compounds having the protective layer surface and the chemically reactive functional group selected from the mouth Roborieteru compound is applied, a lubricating film formed on the CSS area 1. 5 n _m or more thickness The lubricating film formed in the data area has a thickness of 1 nm or more, and the maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the data area is 1.5 or less, and the dynamic friction coefficient is 1.0 or less. Below A magnetic recording / reproducing apparatus characterized in that a maximum static friction coefficient generated between the magnetic head slider and the magnetic disk in the CSS region is 1.0 or less and a dynamic friction coefficient is 0.5 or less. Place.

2 7. A method of manufacturing a magnetic disk in which a base film, a magnetic film, a protective film, and a lubricating film are sequentially stacked on a non-magnetic substrate, wherein the magnetic head slider is positioned when the magnetic disk starts rotating and stops rotating. The CSS area where the surface roughness of the protective film is Ra 10 nm or more, and the data where the surface roughness of the protective film where the magnetic head slider 1 is located during rotation of the magnetic disk is Ra 3 nm or less. Then, the following general formulas (IV) to (VI) F (CF ₂ CF ₂ CF ₂₀ ) _n -C ₂ F ₄ -CONH-C ₃ H ₆ are formed on the surface of the protective film.

— S i (0 C ₂ H.) ₃ · ■ · (IV)

_{F (CF (CF 3) -} CF 2 0) n - CF (CF 3) - C 0NH - C 3 H e

-S i (O C, HJ,

(C ₂ H. 0) ₃ S i-C ₃ H ₆ -NHC 0- (CF, CF ₂₀ ) _m

- (CF ₂ 〇) _n - C_〇 _{_{NH- C 3 H e - S i}} ( 〇 _{_{C 2 H.) 3 · ■ ·}} (VI)

(Where m and n are integers) at least one or more perfluoropolyether compounds having a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether compounds represented by Is applied to the entire surface of the magnetic disk, and the entire surface of the magnetic disk is heated at 80 ° C. or higher or is irradiated with ultraviolet light.

_{_{C e H 5 - 0C, H}} 4 - H 3 N + - 0C 0- (CF 2 CF 2 0) m

One (CF ₂ 0) _n - C_〇〇_ tens NH ₃ - C _B H, - 〇 one _{_{C s H B () F (}} CF 2 CF 2 CF 2 - 0) "- C 2 F, - CH 2 OH _{(VI) H0- CH 2 - (} CF 2 CF i 0), - (CF 2 0) "- CH 2 0 H (DO HO- (CH 2 CH 2 ten) over CH ₂ CF ₂ one (CF ₂ CF ₂ 0),

One (CF ₂ 0) _n —〇CF ₂ CH ₂ (〇一 CH ₂ CH ₂ ) _q —〇H (X)

F (CF ₂ CF _J CF _J 0),-C ₂ F ₄ -C 00 "NHH, — 0 One H ₆ … (XI)

F (CF (CF ₃ ) -CF ₂₀ ) _n -CF (CF ₃ )-CO O— ⁺ NH ₃

_{_{- C 6 H 4 - 0- C}} E H 6 ··· (ΧΠ) - (CF 2 CF 2 0) ra - (CF 2 0) n H - (XII)

(Where m, n, p, and q are integers) a perfluoropolyether compound having an adsorptive functional group selected from perfluoropolyether compounds represented by the following formulas: Next, the data area is washed with a perfluorocarbon-based solvent, and then has a functional group that chemically reacts with the surface of the protective film selected from the perfluoropolyether-based compounds represented by the general formulas (IV) to (VI). A perfluoropolyether compound is applied, and the lubricating film formed in the CSS region has a thickness of 1.5 nm or more, and the lubricating film formed in the data region has a thickness of 1 nm or more. The maximum static friction coefficient generated between the magnetic head slider and the magnetic disk is 1.5 or less, and the dynamic friction coefficient is 1.0 or less, and between the magnetic head slider and the magnetic disk in the CSS region. The maximum static friction coefficient to be generated

A magnetic recording / reproducing apparatus characterized by having a dynamic friction coefficient of 1.0 or less and a dynamic friction coefficient of 0.5 or less.

2 8. The magnetic disk according to claim 1, wherein the diameter of the magnetic disk is 8 8.9 nun or less.

2 9. The method of manufacturing a magnetic disk according to claim 7, wherein the diameter of the magnetic disk is 88.9 rom or less.

30. The magnetic recording / reproducing apparatus according to claim 11, wherein the diameter of the magnetic disk is 88.9 mm or less.